All in His Head

Kiddo: "You know how you give me time-outs when I do something bad?"

Me: "Yes..."

Kiddo: "Well, it's my brain that makes me do the bad thing -- not me -- so it's not my fault. It's my brain's fault, so you shouldn't give me a time-out."

Me: (trying not to laugh) "Yes, well, you have a point there. So how should I give your brain a time-out next time?"

Kiddo gently head-butts me in the arm and waves goodbye to me as he goes upstairs.